If one obtains his livelihood by one of the various means that he has employed, he should not grow to rely on that source, becoming enamored and obsessed with it, and yield his heart to it; for then his reliance on God will be weakened.  He should not think that it can be of more use to him than had already been determined by the Creator.  Instead of exulting in one’s devotion to his profession and in the efforts he has invested in it, one should thank the Creator Who gave him sustenance after he had exerted himself and did not allow his toil and trouble to be in vain, as it is written “You will eat the fruit of the labor of your hands; you will be happy and it will be well with you.” (Tehillim 128:2). ~ Chovos Halevovos